JPH0464298B2 - - Google Patents
Info
- Publication number
- JPH0464298B2 JPH0464298B2 JP13403386A JP13403386A JPH0464298B2 JP H0464298 B2 JPH0464298 B2 JP H0464298B2 JP 13403386 A JP13403386 A JP 13403386A JP 13403386 A JP13403386 A JP 13403386A JP H0464298 B2 JPH0464298 B2 JP H0464298B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- resin
- mold
- hole
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920005989 resin Polymers 0.000 claims description 66
- 239000011347 resin Substances 0.000 claims description 66
- 238000000034 method Methods 0.000 claims description 25
- 238000003825 pressing Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 description 12
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 11
- 238000012545 processing Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 238000005192 partition Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、管壁に管軸方向の通孔が並設された
樹脂管の通孔閉塞方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for closing holes in a resin tube in which holes are arranged in parallel in the tube axis direction in the tube wall.
（従来の技術及びその欠点）
例えば、第５図に示すような樹脂管１の管壁に
管軸方向の多数の通孔１３を並設することによ
り、原材料の使用量を節減し管の軽量化を図ると
ともに、同量の原材料を使用した管に対して偏平
荷重に対する強度を向上させて土圧などの応力に
対する変形を少なくする試みがなされている。こ
のような樹脂管１は、偏平剛性が大きいという特
性を有するために、例えば、下水用埋設管として
利用されている。上記樹脂管１の接続法は、一方
の管の管端部を拡径して管受口とし、これに別の
管の拡径しない管端部を挿入して接着剤やシール
リングなどで接続するのが一般的である。(Prior art and its disadvantages) For example, by arranging a large number of through holes 13 in the tube axis direction in the tube wall of a resin tube 1 as shown in FIG. 5, the amount of raw materials used can be reduced and the tube can be made lighter. At the same time, attempts are being made to improve the strength of pipes made from the same amount of raw materials against flat loads and reduce deformation due to stresses such as earth pressure. Since such a resin pipe 1 has a characteristic of high flat rigidity, it is used, for example, as a buried pipe for sewage. The connection method for the above resin pipe 1 is to expand the diameter of the end of one pipe and use it as a pipe socket, insert the end of another pipe whose diameter does not expand into this, and connect with adhesive or a seal ring. It is common to do so.
しかし、このような接続法では、管壁の通孔１
３が管の内外部に連通して、管内の流体が漏洩し
たり、地下水などが管内に流入したりする恐れが
あり、そのままでは使用することができない。し
たがつて、このような樹脂管１においては、押圧
成形後あるいは二次加工後に受口側および挿口側
の通孔１３を閉塞することが必要である。 However, in such a connection method, the through hole 1 in the pipe wall
3 may communicate with the inside and outside of the pipe, causing the fluid inside the pipe to leak or underground water to flow into the pipe, so it cannot be used as is. Therefore, in such a resin pipe 1, it is necessary to close the through holes 13 on the socket side and the insertion port side after press molding or secondary processing.
そこで、特公昭57−44111号公報においては、
第６図に示すように、加熱した管端部を型１５に
捜入しながら、型１５を回転させてこの管端部を
型１５に押圧し、それにより、通孔隔壁１４をね
じるようにして通孔１３を閉塞することが提案さ
れている。管端部をこのようにねじることによ
り、内・外壁１１および１２を互いに押しつけ通
孔１３を閉塞するというものである。ところが、
このような通孔閉塞加工を施した部分はねじるこ
とによつて内壁１１および／もしくは外壁１２に
くびれ部分が形成されるため、構造的な欠陥を生
じ管が破損する恐れがある。しかも、管壁を潰す
ように圧着するだけであるため、閉塞が充分にな
され得ない。型１５を回転させる操作も著しく煩
雑である。 Therefore, in Special Publication No. 57-44111,
As shown in FIG. 6, while inserting the heated tube end into the mold 15, the mold 15 is rotated to press the tube end against the mold 15, thereby twisting the through-hole partition wall 14. It has been proposed to close the through hole 13 by By twisting the tube ends in this manner, the inner and outer walls 11 and 12 are pressed together and the through hole 13 is closed. However,
When such a hole-blocking process is performed, a constricted portion is formed in the inner wall 11 and/or outer wall 12 by twisting, which may cause a structural defect and damage the tube. Moreover, since the tube wall is simply crimped to crush the tube wall, sufficient closure cannot be achieved. The operation of rotating the mold 15 is also extremely complicated.
特開昭54−103480号公報には、第７図ａおよび
ｂに示すように、管端部の通孔閉壁１４を加熱し
つつ切断具１６を用いて切断し、次いで、押圧型
１７に押しつけることにより内・外壁１１および
１２を互いに圧着させる方法が開示されている。
しかし、この方法においても、押し潰された部分
の密着性は必ずしも万全とは言えない。作業工程
も多く煩雑である。 JP-A-54-103480 discloses that, as shown in FIGS. 7a and 7b, the through-hole closing wall 14 at the end of the tube is cut using a cutting tool 16 while being heated, and then it is cut into a pressing mold 17. A method of crimping the inner and outer walls 11 and 12 together by pressing is disclosed.
However, even with this method, the adhesion of the crushed portion cannot necessarily be said to be perfect. The work processes are many and complicated.
このように上記二方法においては、いずれも押
圧により通孔１３を押し潰しているだけであるた
めに、通孔１３の閉塞後に受口加工などの二次加
工が施されたり、落下などの衝撃や経時変化など
により、閉塞部分が開いてしまう危険性が高い。
また、溶融温度と分解温度とが近い塩化ビニル樹
脂からなる樹脂管の場合には、加熱温度と加熱時
間との管理が必要であり、煩雑である。 As described above, in both of the above two methods, since the through hole 13 is simply crushed by pressure, secondary processing such as socket machining may be performed after the through hole 13 is closed, or shocks such as dropping may occur. There is a high risk that the occluded part will open due to changes in the area or over time.
Further, in the case of a resin pipe made of vinyl chloride resin whose melting temperature and decomposition temperature are close to each other, it is necessary to control the heating temperature and heating time, which is complicated.
他方、シリコン樹脂などのコーキング材を通孔
１３内に注入して閉塞する方法がある。しかし、
各通孔毎に個々にコーキング材を注入することは
極めて煩雑であり、各通孔毎のシール性にばらつ
きを生じる。しかも、シリコン樹脂と塩化ビニル
樹脂とは相溶性を欠く。その結果、充分な閉塞効
果を奏し得ない。 On the other hand, there is a method of injecting a caulking material such as silicone resin into the through hole 13 to close it. but,
Injecting caulking material into each hole individually is extremely complicated and causes variations in sealing performance for each hole. Moreover, silicone resin and vinyl chloride resin lack compatibility. As a result, a sufficient occluding effect cannot be achieved.
樹脂管１の管壁端面に弾性材でなる盲板を圧着
させる方法も提案されている。しかし、簡単な外
力ではずれることがあり、完全な閉塞方法とは言
えない。 A method has also been proposed in which a blind plate made of an elastic material is crimped onto the end surface of the tube wall of the resin tube 1. However, it may come off with a simple external force, so it cannot be said to be a complete closure method.
（発明が解決しようとする問題点）
本発明は上記従来の問題点を解決するものであ
り、その目的とするところは、管壁に管軸方向の
通孔が並設された樹脂管の各通孔を樹脂管の樹脂
を分解することなく確実、閉塞しうる方法を提供
することにある。本発明の他の目的は、受口加工
などの二次加工あるいは衝撃や繰り返し圧縮偏平
荷重などの応力に対して閉塞部のシール性を長期
にわたり確保しうる樹脂管の通孔閉塞方法を提供
することにある。本発明のさらに他の目的は、作
業性に富み、経済性に優れた樹脂管の通孔閉塞方
法を提供することにある。本発明のさらに他の目
的は、通孔を閉塞すると同時に受口加工などを行
いうる樹脂管の通孔閉塞方法を提供することにあ
る。(Problems to be Solved by the Invention) The present invention is intended to solve the above-mentioned conventional problems, and its purpose is to solve the problems of the conventional art. It is an object of the present invention to provide a method for reliably closing a through hole without decomposing the resin of a resin pipe. Another object of the present invention is to provide a method for closing a hole in a resin pipe, which can ensure the sealing performance of the closed part for a long period of time against secondary processing such as socket processing or stress such as impact and repeated compressive flat loading. There is a particular thing. Still another object of the present invention is to provide a method for closing a hole in a resin pipe, which is highly workable and economical. Still another object of the present invention is to provide a method for closing a hole in a resin pipe, which allows for socket processing to be performed at the same time as closing the hole.
（問題点を解決するための手段）
本発明の通孔閉塞方法においては、誘電体であ
る樹脂管を高周波電場内に置くと、各分子は高周
波電界によつて回転振動を起こし、隣り合つた分
子相互間の摩擦によつて誘電体損を生じて熱を発
生する高周波誘電加熱を利用している。(Means for Solving the Problems) In the hole closing method of the present invention, when a dielectric resin tube is placed in a high frequency electric field, each molecule causes rotational vibration due to the high frequency electric field, and the adjacent molecules It uses high-frequency dielectric heating, which generates heat by causing dielectric loss due to friction between molecules.
即ち、本発明の通孔閉塞方法は、樹脂管の管端
部を、傾斜状に拡径もしくは縮径した状態で管端
側に環状間隙が形成される内型と外型との間に該
環状間隙に管端が位置するように挟持し、該環状
間隙内の管端部を押圧リングで押圧しながら、内
型と外型との間又は管端部を挟圧する内型もしく
は外型と押圧リングとの間に高周波電流を印加す
ることを特徴とする。 That is, the through-hole closing method of the present invention involves forming an annular gap between an inner mold and an outer mold in which an annular gap is formed on the pipe end side with the end of the resin pipe expanded or contracted in diameter in an inclined manner. An inner mold or an outer mold that clamps the pipe end so that it is located in the annular gap, and presses the pipe end between the inner mold and the outer mold or presses the pipe end while pressing the pipe end within the annular gap with a pressure ring. A feature is that a high frequency current is applied between the press ring and the press ring.
（作用）
本発明においては、樹脂管の管端部を傾斜状に
拡径もしくは縮径した状態で、管端側に環状間隙
が形成される内型と外型との間に該環状間隙に管
端が位置するように挟持するので、環状間隙内に
おける管端部は傾斜しており、この傾斜した管端
部を管端側から押圧リングで押圧するので管端部
では内外壁が斜め方向に押しつけられるように力
が作用し内外壁を押しつけやすい。一方押圧リン
グで押圧しながら内型と外型との間又は管端部を
挟圧する内型もしくは外型と押圧リングとの間に
高周波電流を印加するので、管端部では高周波誘
電加熱により特に金型に接触していない樹脂管の
通孔隔壁及び内外壁の内面側が溶融軟化し、内外
壁が押しつけられて管端部の通孔が融着閉塞され
るのである。(Function) In the present invention, when the tube end of the resin tube is expanded or contracted in diameter in an inclined manner, the annular gap is formed between the inner mold and the outer mold, which form an annular gap on the tube end side. Since the tube ends are held in the same position, the tube ends in the annular gap are inclined, and since the inclined tube ends are pressed from the tube end side with the pressure ring, the inner and outer walls of the tube ends are in the diagonal direction. The force acts as if being pressed against the inner and outer walls, making it easy to press against them. On the other hand, while pressing with a pressure ring, a high frequency current is applied between the inner mold and the outer mold, or between the inner mold or outer mold that pinches the tube end, and the press ring, so that the tube end is particularly heated by high frequency dielectric heating. The inner surfaces of the through-hole partition wall and inner and outer walls of the resin tube that are not in contact with the mold are melted and softened, and the inner and outer walls are pressed against each other, and the through-hole at the end of the tube is fused and closed.
（実施例）
本発明に用いる樹脂管は、第１図に示すよう
に、管壁に管軸方向に沿つて複数の通孔１３を有
する。樹脂管１の材質としては、上記高周波誘電
加熱における発熱量の大きな熱可塑性樹脂が好適
に用いられる。例えば、塩化ビニル樹脂、ポリア
ミド、あるいはメタクリル樹脂などである。その
中でも、軟質塩化ビニル樹脂は、温度上昇に伴い
発熱量が急激に上昇するため、比較的低温度域で
も溶融軟化する。したがつて、軟質塩化ビニルで
なる樹脂管１は、その管端部に特別な予備加熱軟
化工程を施すことなく管端部の通孔１３の閉塞が
行われる。他方、軟質塩化ビニル樹脂に較べて発
熱量の低い硬質塩化ビニル樹脂でなる樹脂管１
は、溶融温度近くまで溶融軟化しないため直接高
周波誘電加熱を樹脂管１の管端部に施すと通孔隔
壁１４などの断面積の小さい部分に熱応力が集中
し焦げて樹脂が分解する場合がある。したがつ
て、硬質塩化ビニル樹脂製の樹脂管１などは、高
周波誘電加熱を施す直前に、例えば、ヒーターを
内臓した熱板に接触させたり加熱炉に入れるなど
して樹脂管１の管端部に予備加熱を施して均一に
加熱しておくことが望ましい。それにより、発熱
量を高めることができ、高周波誘電加熱が効果的
に行われる。予備加熱温度は使用する樹脂管１の
材質や形状に依在するが、例えば、硬質塩化ビニ
ル樹脂製の樹脂管１では100〜150℃の範囲内の温
度に適宜設定される。(Example) As shown in FIG. 1, the resin pipe used in the present invention has a plurality of through holes 13 in the pipe wall along the pipe axis direction. As the material for the resin tube 1, a thermoplastic resin that generates a large amount of heat during high-frequency dielectric heating is preferably used. For example, vinyl chloride resin, polyamide, or methacrylic resin. Among them, the soft vinyl chloride resin rapidly melts and softens even in a relatively low temperature range because its calorific value increases rapidly as the temperature rises. Therefore, in the resin pipe 1 made of soft vinyl chloride, the through hole 13 at the end of the pipe can be closed without subjecting the end of the pipe to a special preheating and softening process. On the other hand, the resin pipe 1 is made of hard vinyl chloride resin, which has a lower calorific value than soft vinyl chloride resin.
does not melt and soften close to its melting temperature, so if high-frequency dielectric heating is applied directly to the end of the resin tube 1, thermal stress will be concentrated in parts with small cross-sectional areas such as the through-hole partition wall 14, which may cause scorching and decomposition of the resin. be. Therefore, immediately before applying high-frequency dielectric heating to a resin pipe 1 made of hard vinyl chloride resin, the end of the resin pipe 1 is heated by, for example, contacting a hot plate with a built-in heater or placing it in a heating furnace. It is desirable to preheat the material to ensure uniform heating. Thereby, the amount of heat generated can be increased and high frequency dielectric heating can be performed effectively. Although the preheating temperature depends on the material and shape of the resin pipe 1 used, for example, in the case of the resin pipe 1 made of hard vinyl chloride resin, it is appropriately set to a temperature within the range of 100 to 150°C.
特に、本発明においては、樹脂管の管端部を傾
斜状に拡径もしくは縮径する際には管端部を加熱
軟化させて行う必要があるので、このときの加熱
状態が冷えないうちに連続して高周波電流を印加
するのが好ましい。 In particular, in the present invention, when expanding or contracting the diameter of the end of the resin pipe in an inclined manner, it is necessary to heat and soften the end of the resin pipe. It is preferable to apply a high frequency current continuously.
以下に本発明を図面に示す実施例に基いて説明
する。 The present invention will be explained below based on embodiments shown in the drawings.
第１図は本発明の樹脂管の通孔閉塞方法の一実
施態様を一部断面で示す側面図である。図で１は
管壁に管軸方向の通孔１３が並設された樹脂管、
２は内型２１と外型２２とからなる金型、３は環
状の押圧リング、４は高周波発生機である。 FIG. 1 is a side view, partially in section, showing an embodiment of the method for closing a hole in a resin pipe according to the present invention. In the figure, 1 is a resin pipe in which through holes 13 in the pipe axis direction are arranged in parallel on the pipe wall.
2 is a mold consisting of an inner mold 21 and an outer mold 22, 3 is an annular pressing ring, and 4 is a high frequency generator.
内型２１は中間部分に傾斜部を有しており、端
部で支持具５１により固定台５に固定されてい
る。外型２２は軸方向の分割面にて二つ割となさ
れ、それぞれが内型２１に対して接近・離反可能
に設けられている。内型２１と外型２２と間には
樹脂管１を挟持する間隙が設けられ、内型２１に
外型２２を接近させたときに樹脂管１を挟持する
ようになされている。また、内型２１と外型２２
の間には樹脂管１を挟持した状態で樹脂管１の管
端側に環状間隙２３が形成され、この環状間隙２
３内に環状の押圧リング３が設けられている。こ
の押圧リング３はアーム３１を介して流体シリン
ダー３２に連結されており、流体シリンダー３２
の作用により環状間隙２３内を挿入後退可能とな
されている。２４，２５はそれぞれ内型２１と外
型２２の傾斜部に設けられた電極材であり、黄
銅、銅などの高導電性を有する材料からなり、こ
の電極はそれぞれ絶縁導線を介して高周波発生機
４に接続されている。電極２４，２５は内型２１
及び外型２２との間を絶縁材で絶縁されている。 The inner mold 21 has an inclined part in the middle part, and is fixed to the fixing base 5 by a support 51 at the end part. The outer mold 22 is divided into two parts at the dividing plane in the axial direction, and each part is provided so as to be able to approach and separate from the inner mold 21. A gap is provided between the inner mold 21 and the outer mold 22 to sandwich the resin tube 1, so that when the outer mold 22 approaches the inner mold 21, the resin tube 1 is sandwiched therebetween. In addition, the inner mold 21 and the outer mold 22
An annular gap 23 is formed on the tube end side of the resin tube 1 with the resin tube 1 sandwiched therebetween, and this annular gap 2
3, an annular pressure ring 3 is provided. This pressing ring 3 is connected to a fluid cylinder 32 via an arm 31, and the fluid cylinder 32
It is possible to insert and retreat within the annular gap 23 by the action of. Reference numerals 24 and 25 designate electrode materials provided on the inclined parts of the inner mold 21 and the outer mold 22, respectively, and are made of a highly conductive material such as brass or copper. Connected to 4. The electrodes 24 and 25 are the inner mold 21
and the outer mold 22 are insulated with an insulating material.
上記の装置を使用して本発明の通孔閉塞方法を
説明する。まず、第２図に示すように、外型２２
を内型２１からはなし、押圧リング２を後退した
状態において、管端部を熱風炉で加熱軟化した硬
質塩化ビニル製樹脂管１を内型２１に被嵌し、管
端部を内型２１の傾斜部に押しつけて拡径する。
このとき管端は傾斜部を越えて環状間隙２３に位
置するように押し込む。次いで、第３図に示すよ
うに外型２２を内径２１に向けて接近させて樹脂
管１を挟持する。その後押圧リング３を流体シリ
ンダー３２により樹脂管１の管端に向けて押圧し
ながら電極２４，２５に高周波電流を印加する。
使用する高周波電流の周波数、電界強度および印
加時間などは樹脂管１の材質、形状、大きさ、電
極の間隙などにより適宜決められるが、硬質塩化
ビニルからなる厚さ10mm程度の樹脂管の場合では
40MHzの高周波電流を電源出力3KWにて５〜30
秒間印加すればよい。また、押圧リング３による
押圧力は２Kg／cm2以上特に２〜６Kg／cm2の範囲と
するのが好ましい。 The method for closing a hole according to the present invention will be explained using the above-mentioned device. First, as shown in FIG.
is removed from the inner mold 21, and with the press ring 2 retracted, a hard vinyl chloride resin pipe 1 whose tube end has been heated and softened in a hot air oven is fitted into the inner mold 21, and the tube end is inserted into the inner mold 21. Press against the slope to expand the diameter.
At this time, the tube end is pushed over the inclined portion and positioned in the annular gap 23. Next, as shown in FIG. 3, the outer mold 22 is brought closer toward the inner diameter 21 to clamp the resin tube 1. Thereafter, a high frequency current is applied to the electrodes 24 and 25 while pressing the press ring 3 toward the end of the resin tube 1 using the fluid cylinder 32.
The frequency, electric field strength, application time, etc. of the high-frequency current to be used are appropriately determined depending on the material, shape, size, electrode gap, etc. of the resin tube 1, but in the case of a resin tube made of hard PVC with a thickness of about 10 mm,
40MHz high frequency current at 3KW power supply output 5 to 30
It is sufficient to apply it for a second. Further, the pressing force by the pressing ring 3 is preferably 2 kg/cm 2 or more, particularly in the range of 2 to 6 kg/cm 2 .
このようにして内型２１と外型２２の間に挟持
された拡径された管端部は押圧リング３による押
圧により管内壁が管外壁に向けて押圧されなが
ら、高周波電流の印加により加熱溶融されて内外
壁が融着される。管端部の内外壁表面は内型２１
及び外型２２に接触しているので溶融することは
なく、通孔隔壁及び内外壁の内面側が溶融して融
着され、通孔が閉塞される。このとき、押圧され
て押しのけられた溶融樹脂は通孔内に充満するの
で、融着面積が広がり、通孔の閉塞強度が向上す
る。 In this way, the diameter-enlarged tube end held between the inner mold 21 and the outer mold 22 is heated and melted by application of high-frequency current while the inner wall of the tube is pressed toward the outer wall of the tube by the pressure applied by the press ring 3. The inner and outer walls are fused together. The inner and outer wall surfaces of the tube end are the inner mold 21.
Since it is in contact with the outer mold 22, it does not melt, and the inner surfaces of the through-hole partition wall and the inner and outer walls are melted and fused, and the through-hole is closed. At this time, the pressed and displaced molten resin fills the through hole, thereby increasing the fused area and improving the closing strength of the through hole.
尚、上記例において、電極２４，２５を内型２
１と外型２２に設けているが、電極２４を押圧リ
ング３に設けてもよい。 In the above example, the electrodes 24 and 25 are placed in the inner mold 2.
Although the electrode 24 is provided on the press ring 1 and the outer mold 22, the electrode 24 may be provided on the press ring 3.
また、管端部を拡径する代りに縮径してもよ
い。このとき管端部を縮径するには、傾斜縮径部
を設けた内型に樹脂管を押し込み、半割りの外型
で押さえつければよい。また内型を抜き出すには
径の大なる部分を軸方向に複数の割型として拡縮
径可能なものとする必要がある。 Furthermore, the diameter of the tube end may be reduced instead of being enlarged. In order to reduce the diameter of the tube end at this time, it is sufficient to push the resin tube into an inner mold provided with an inclined diameter reducing part and press it down with a half-split outer mold. Further, in order to extract the inner mold, it is necessary to make the large diameter part into a plurality of split molds in the axial direction so that the diameter can be expanded and contracted.
本発明の通孔閉塞方法を実施するに当つては樹
脂管１の管端部の通孔を閉塞するだけでなく、樹
脂管１の配管時に必要な受口加工もしくは挿口加
工と同時に行うのが効率的である。第４図はゴム
輪を使用して管を接続する場合におけるゴム輪受
口を成形する場合の例を示している。第４図で第
１図と同じ部品は同じ番号を付している。 In carrying out the hole closing method of the present invention, it is necessary not only to close the through hole at the end of the resin pipe 1, but also to perform socket processing or insertion processing that is necessary when piping the resin pipe 1. is efficient. FIG. 4 shows an example of forming a rubber ring socket when connecting pipes using a rubber ring. In FIG. 4, the same parts as in FIG. 1 are given the same numbers.
内型２１は管受口の内周面と同じ外形を有して
いる。この内型２１の中間に割型２６が設けら
れ、この割型２６の中心に設けられた円錐形状空
間部２７に軸方向に往復移動可能な円錐形状ロツ
ド２８を係合させることにより、割型２６が拡縮
径自在となされてゴム輪をはめる環状溝が形成さ
れるようになされている。この内型２１及び外型
２２の後部には傾斜部が形成され、この位置に電
極２４，２５が設けられている。この装置におい
ても、樹脂管１を内型２１に被嵌して、ゴム輪受
口を形成する点を除けば、前記実施例と同様にし
て管端部の通孔が溶着閉塞される。 The inner mold 21 has the same outer shape as the inner peripheral surface of the pipe socket. A split mold 26 is provided in the middle of the inner mold 21, and a conical rod 28 that is movable back and forth in the axial direction is engaged with a conical space 27 provided at the center of the split mold 26. The diameter of the ring 26 can be expanded or contracted to form an annular groove into which a rubber ring is fitted. Slanted portions are formed at the rear portions of the inner mold 21 and the outer mold 22, and electrodes 24 and 25 are provided at these positions. In this device as well, the through hole at the end of the tube is welded and closed in the same manner as in the previous embodiment, except that the resin tube 1 is fitted into the inner mold 21 to form a rubber ring socket.
（発明の効果）
本発明の樹脂管の通孔閉塞方法は上述した通り
の構成であつて、樹脂管の管端部を拡径もしくは
縮径して傾斜した状態で管端側から押圧リングで
押圧するので、管端部では内外壁が斜め方向に押
しつけられることになつて通孔が閉塞され易いと
共に、同時に高周波電流を印加するので高周波誘
電加熱により樹脂管の通孔隔壁及び内外壁の内面
側が溶融軟化して融着し通孔が完全に閉塞され
る。したがつて、拡径などの二次加工あるいは衝
撃や繰り返した圧縮偏平荷重などの応力に対して
も、閉塞部のシール性を長期にわたり確保しう
る。しかも、作業性に富むため、経済性に優れて
いる。また、高周波誘電加熱は内部発熱であるた
め、金型面への樹脂の付着が全くない。短時間で
通孔の閉塞を行いうるので樹脂管を分解する恐れ
もない。また、金型の内型として受口加工用金型
を用いることにより、樹脂管の通孔を閉塞すると
同時に拡径加工を行うことができ、経済性をさら
に向上させうる。樹脂管に予備加熱を施すことに
より、硬質塩化ビニルなどにも適用しうる。(Effects of the Invention) The method for closing a hole in a resin pipe according to the present invention has the configuration as described above, and the end of the resin pipe is expanded or contracted in diameter and is tilted, and then a pressure ring is applied from the end of the resin pipe. As the pressure is applied, the inner and outer walls of the resin tube are pressed diagonally at the end of the tube, making it easy to block the through hole.At the same time, since a high frequency current is applied, high frequency dielectric heating causes the inner surfaces of the through hole partition wall and the inner and outer walls of the resin tube to be closed. The sides melt and soften and fuse together, completely closing the through hole. Therefore, the sealing performance of the closed portion can be ensured for a long period of time even against secondary processing such as diameter expansion or stress such as impact or repeated compressive flattening loads. Moreover, since it is easy to work with, it is economical. Furthermore, since high-frequency dielectric heating generates internal heat, no resin adheres to the mold surface at all. Since the through hole can be closed in a short time, there is no risk of disassembling the resin pipe. Further, by using a socket processing mold as the inner mold of the mold, the diameter expansion processing can be performed at the same time as closing the through hole of the resin pipe, and the economical efficiency can be further improved. By preheating the resin pipe, it can also be applied to hard vinyl chloride.
第１図は本発明の通孔閉塞方法の一実施態様を
一部断面で示す側面図、第２図は第１図における
実施態様の最初の段階を一部省略して示す断面
図、第３図は第２図の次の段階を示す断面図、第
４図は本発明の別の実施態様を一部断面で示す側
面図、第５図は本発明において使用する樹脂管を
示す斜視図、第６図及び第７図は従来の通孔閉塞
方法を説明するための断面図である。
１…樹脂管、１１…内壁、１２…外壁、１３…
通孔、１４…通孔隔壁、２…金型、２１…内型、
２２…外型、２３…環状間隙、２４，２５…電極
材、３…環状の押圧リング、４…高周波発生機。
FIG. 1 is a side view partially showing an embodiment of the through hole closing method of the present invention, FIG. 2 is a sectional view partially omitting the first step of the embodiment in FIG. 1, and FIG. The figure is a cross-sectional view showing the next step from FIG. 2, FIG. 4 is a side view partially showing another embodiment of the present invention, and FIG. 5 is a perspective view showing a resin pipe used in the present invention. FIGS. 6 and 7 are cross-sectional views for explaining a conventional method for closing a through hole. 1...Resin pipe, 11...Inner wall, 12...Outer wall, 13...
Through hole, 14... Through hole partition, 2... Mold, 21... Inner mold,
22... Outer mold, 23... Annular gap, 24, 25... Electrode material, 3... Annular pressing ring, 4... High frequency generator.
Claims (1)
の管端部の通孔開口を閉塞する方法であつて、該
樹脂管の管端部を、傾斜状に拡径もしくは縮径し
た状態で管端側に環状間隙が形成される内型と外
型との間に該環状間隙に管端が位置するように挟
持し、該環状間隙内の管端部を環状の押圧リング
で押圧しながら、内型と外型との間又は管端部を
挟圧する内型もしくは外型と押圧リングとの間に
高周波電流を印加することを特徴とする管壁に管
軸方向の通孔が並設された樹脂管の通孔閉塞方
法。1. A method of closing the through-hole opening at the end of a resin pipe in which a through-hole is provided in the pipe wall along the pipe axis direction, and the end of the resin pipe is expanded or contracted in diameter in an inclined manner. In this state, an annular gap is formed on the tube end side.The tube end is held between the inner mold and the outer mold so that the tube end is located in the annular gap, and the tube end in the annular gap is held with an annular pressing ring. A through hole in the tube axis direction in the tube wall characterized by applying a high frequency current between the inner mold and the outer mold or between the inner mold or the outer mold that pinches the tube end and a press ring while pressing. A method for closing holes in resin pipes installed in parallel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13403386A JPS62290518A (en) | 1986-06-10 | 1986-06-10 | Blockading of through hole of resin tube provided with axial through hole in tube wall in parallel |
| CA000518715A CA1274665A (en) | 1986-06-10 | 1986-09-22 | Method for closing the opening of each of the through- holes formed in the pipe-wall of a resin pipe and extending parallel to the axis of said pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13403386A JPS62290518A (en) | 1986-06-10 | 1986-06-10 | Blockading of through hole of resin tube provided with axial through hole in tube wall in parallel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62290518A JPS62290518A (en) | 1987-12-17 |
| JPH0464298B2 true JPH0464298B2 (en) | 1992-10-14 |
Family
ID=15118800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13403386A Granted JPS62290518A (en) | 1986-06-10 | 1986-06-10 | Blockading of through hole of resin tube provided with axial through hole in tube wall in parallel |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS62290518A (en) |
| CA (1) | CA1274665A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110052537B (en) * | 2019-05-28 | 2024-04-12 | 芜湖众力底盘系统有限公司 | Stamping and rolling die structure for variable-section special-shaped pipe fitting |
-
1986
- 1986-06-10 JP JP13403386A patent/JPS62290518A/en active Granted
- 1986-09-22 CA CA000518715A patent/CA1274665A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA1274665A (en) | 1990-10-02 |
| JPS62290518A (en) | 1987-12-17 |
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